Fix speech bubble positions

[NovaSquirrel]

Right now there's a bug where scene changes don't actually kick in at the right time, and I've been working around that by moving the scene changes in the script where it works properly, but now speaker changes use the positions from the old scene.

I've got the following options:

• Actually fix the scene change problem, lol
• Change how the speaker position is set, by actually directly specifying position with each speaker switch
• Yet more hacky stuff

Option 2 sounds easiest and cleanest, but option 1 would be the most proper so I'll probably attempt that first.

[NovaSquirrel]

Fixed this in a really dumb way that involves reading from character RAM to determine if there's any text to display or not.